I strongly think that primary reform should be a major topic in both parties, with this being a fantastic opportunity to do away with abominations like the Iowa Caucus (and caucuses in general) and create a far more streamlined primary process, perhaps starting in March and lasting through May.
If parties were more open to experimenting, this would be the perfect time to roll out IRV. IRV would be perfect for primaries, with their clown-car assortment of huge numbers of candidates.
I've been hoping, for many years, that the whole country would do away with allowing each state to choose its own date for presidential caucus or primary. I've been hoping for a nation-wide schedule to be set up in which no state is allowed to hold a primary caucus before April 1, that only small states (1 or 2 seats in the House of Reps) hold them during April, only medium-size states (3 to 10 seats in the House) hold them during May, and lastly make all of the largest states wait until June. So I hope you're right that, because of this year's election, both parties are going to be eager for significant changes.
I don't see how that's going to happen. The parties are happy to let the state governments pay for the primary (in most states), meaning that the states are free to choose their own dates. Now, the parties can and are influencing the date selection by imposing penalties for states going outside a specified window, but to herd the states as significantly as what you're suggesting seems unrealistic as long as the states are running the elections and footing the bill.
