That sounds too little to pay for a decent quality system which will last 20 years. For decent components, from a reputable supplier you'd be expecting to pay around twice that.
You're also discounting the need to have power after the sun goes down. If you compare roof top to mains, you really need to include the cost of a battery large enough to go off grid, which is at least another $10k, and quite a bit more if you don't want to have any lifestyle changes.
I have a 5.5 kw roof system that I am very happy with, but I won't pretend that it replaces mains power.
I also expect to be keeping mains for a long time yet. I have a desire to make my next car electric. I used to think that the grid would go into a death spiral inches batteries got cheap enough. Now I think electric cars will save it.
I think solar and storage are the future and really want that future now, and I think you do as well. But you do it a disservice by overselling the case.