Doing Laundry!

So I have been thinking baout this - why should people be forced to buy a washer and a dryer seperately? The whole frikkin' cabinet is occupied? Why dont more manufacturers make more of combined washer and dryers? I think it is quite simple to retrofit a washer and make it a washer and dryer (and my wife wouldnt nag me about moving clothes from the washer to the dryer)
Here is what one needs:
1. A few switches and a timer dial
2. A humidity detector (I have a circuit for an expensive one around 5$)
3. A heater with a fan
4. Odds and ends like wires, rubber tubing etc

Open the washer, splice the water feed pipe and make it a dual input single output. One input is water, other input comes from the heater fan. Put a switch to toggle between 'Wash' and 'Dry' mode. In the water output, connect a humidity detector. As soon as humidity goes below 90%, add some electronics to switch off the dryer. You can also add a timer to switch off the dryer.
This would work very well with the front loading washing machines.