When I got my first scope 20 odd years ago a 6" reflector was classed as a large amateur telescope and a decent GEM mount was pretty expensive to a working fella. Nowadays they are pretty well entry level and much more affordable. Quality has improved too.
I doubt there will be many major changes in the basic scope/eyepiece design side. Probably more and improved electronics.
Wireless comms for guiding and imaging, getting rid of the birds nest of cables needed at the moment would be my ideal.
Bill
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