The cost will go down. It costs no more to make a glass panel than the
gyros they replace, maybe less.

For an idea of what it can cost, you can get an experimental AI
replacement that has an AI, TC, VSI and probably some other stuff I've
forgotten for under $2000. All electronic, with no mechanical gyros.
And they work!

I really don't think it's all that big an issue. Just train and become
competent with what you have, and fly it.

IFR IMC flight is mostly about what to do if something becomes
non-functional anyway. So have lots of backups and know how to cross
check to determine just what is going on.