My suggestion is pretty basic so I'll keep it short:
I've been playing this game since 1993 when the creators and early adopters were selling Alpha out of the back of a van driving between conventions and gaming stores.
What I want, more than anything in the world when it comes to this game (other than the Achievement System I proposed) is for the original sets to come back.
Those last three aren't such a big deal for me but it would be such a blast to see everything from Fallen Empires back make a return. Not to Standard or current Historic, obviously, but a new mode perhaps?
I still have so many cards from those days but health issues means I no longer get to go out and play paper Magic at gaming stores or other meeting places, and all my old friends quit and gave away or sold their collections long ago.
I'd love to be able to re-create my complete Black/Artifact collection of those blocks digitally and play with them again.
Get that feeling like when I sold my SNES and games so I could buy cards and got my first copy of Lich, The Abyss, Word of Command, Moxes....I miss Chains of Mephistopheles.
I miss the grimdark, hard-to-utilize cards and setting of The Dark.
And **** do I miss Phyrexia and Yawgmoth and thrulls.
Please, consider it!
And I have no doubt there are many, many more old heads like me who long for the old days and old style of MtG.