One thing is for sure, Bitcoin will have major development. Probably it will be upgraded to be quantum computer proof. Lightning network will be at its best , scaling large volume of bitcoin transaction thinking that Bitcoin will be main stream and being used as alternative currency by that time. Price, it is kinda hard to speculate but I have a feeling that it will be several times higher than the price today.
The changes in legality is happening right now. By that time (after 10 years) I think Bitcoin standards are already set so there will be no problem in terms of acquiring and trading Bitcoin except if we do not have fund of course/