I don't think many of existing games will be ported, but B-class (with medium budgets) games are coming to Linux in a big way. Wasteland 2, Eternity, Godus, Castle Story, Planetary Annihilation, War for the Overworld, Double Fine, Maia... "Indie" usually means a budget of around $100000, and smallest of these are multiples of that. Plus, almost all humble indie bundles fully support Linux.

I think the outcome is clear: some of these games will make a lot of money. Big publishers and devs will want a cut of the pie.