Here is an old post of mine telling you about my first time cleaning the sensor:

I am with the majority and clean my own sensor. I'm an outdoor photographer in Florida. High humidity blowing sand we got it all. I will try to find shelter when changing lenses but sometimes that's impossible.
I had read and seen videos on the net about cleaning the sensor. I decided to give it a whirl pearl.
I was like a virgin on prom night. This was my first time and really nervous. I brushed and blew the outside of my camera off. Then removed the lens and took the Rocket Blower and shot a couple of blasts of air inside the camera. I put the lens back on went outside and took some pictures of the sky. Back inside I went downloaded the pictures and, nope spots still there mostly in the different places. I repeated the first couple of steps and then got the Rocket Blower out again and then I fired up the Artic Butterfly. I looked into the camera and stared at the (what everybody calls the sensor but is a plate over it) and with a shaking hand wiped the sensor in one direction and then the other. My heart was pounding like crazy, I could hear it in my ears. I put the camera back together and headed outside once more to shoot the sky. I then came back in downloaded the pictures and low an behold I was down to 3 spots. Here we go I know the third time is the charm Mr. Murphy loves threes, this was it the do it or die moment. Brushed off the camera took off the lens, hit the sensor with the Rocket Blower, hit the sensor with the Artic Butterfly. Now I opened the package of sensor swabs. I am starting to shake. Each swab is packed in a cellophane package. I fumble to get the package open, I am holding the swab in one hand, trying not to touch anything with it and knowing there are humongous particles flying around inside my house. The particles look like balls with diamond spikes sticking out and they are slamming into that swab, just waiting to scratch the hell out of my sensor. I open the bottle of sensor cleaner, and by now I am shaking like a canary trying to pass a peach seed, I gingerly try to get two drops of solution onto the swab. I empty about a quarter of the bottle on my hand and arm but do manage to finally get the couple of drops on the swab. Look out camera I going in. I notice the swab fits perfectly on the sensor, I swipe one way then the other, I remove my trembling hand, drop the swab, slap a lens on, light up a cigarette (I don't smoke) poured a glass of single malt scotch, and go outside to take pictures of the sky once more. Upon checking this time, Wahoo, no spots. Piece O' cake.
After that fiasco I bought a sensor loupe so I could look and see if any crud was on the sensor.

I clean my sensor about 3 to 4 times a year and just do it. No shaking, no sweats, and like the Virgin on prom night, I stop and think "Is that all there is?"

A part of it is the big name brands cameras are "too good". They reached the MP level for up to 16x20 or so prints long ago and features that are way more than the casual photographer/snap shooter wants or cares to make use of and they are so well built they last a long time. So most of the market is saturated.
New customers often are content with their cell phones.
So they need to cut down on the large line ups of so many models, esp the P&S since those are the ones the cell phones replace. They should concentrate on the best they can produce for the money in say three or at most 4 models (dslr or mirrorless-which ever people want). Beginner, intermediate, high end and a pro level "HOW MUCH DOES THAT THING COST?" In the point and shoots make just a couple of models one that has a better sensor than a cell phone with a good control layout, and one high end one with a great sensor, lens and controls but small enough to go in a pocket for those serious photographers who sometimes want or need a small light camera for "just in case". I carry a nearly antique Panasonic ZS6 in my shirt pocket when I leave the house. Then one very good bang for the buck bridge/superzoom for those who want more than a P&S but don't want to carry or change lenses.
I seem to remember in the late 50s or 60s Nikon made a modular SLR that the pros could swap out things, my two Miranda Sensorex's had a modular view finder, pentaprism and pop it out and slide in a waist level with magnifier. If they even made them so sensors etc could be upgraded that would be great. A lot of people would be more likely to go for a newer sensor or processor instead of buying a whole new camera.