There is probably a market now for one of the players, probably HTC, Samsung or Motorola, to build a line of phones specifically targeted at this segment. If I were them I'd:
1) Build tools to assist with migrating BB server data and user phone data
2) Build some models with a solid keyboard and smaller screen
3) Build some type of advanced encryption, possibly with a fingerprint reader.
I think Motorola would be the best candidate. HTC is chinese, which is already a major ding. With Motorola being an American company, plus now having the ability to build the phones in the US, I think the combination (without advertising it this way so as to no annoying other countries) of patriotism, and the fact that the US government would be less likely to be spying on it as the chinese (of course, after Edward Snowden, who knows...).
Plus Motorola still has an image of being the communications giant for the military and commercial sector via walkie talkies, and other communications equipment.