Was/Is Westinghouse doing anything with smaller scale reactor technologies (Thorium,etc). If not, does this potentially open a door for those technologies?
Westinghouse is likely too large a company to experiment--probably a smaller company will be first. Perhaps Terrestrial Energy in Canada will get their molten salt reactor to work. In Russia, the Akademik Lomonosov, a nuclear barge, will replace the power plant in Bilibino Nuclear Power plant in a couple years. This qualifies as a small reactor.
No, Thorium is competition for them in an already difficult (economically) business. It might, maybe, indirectly shake something loose, but probably not.