Wooooow.
I see that it would move from Channel 33 in Springfield to Channel 23 in Boston, and it would have to give up the CBS affiliation and programming to a WGGB subchannel, since we all know there's only one 'BZ in Boston. It would also mean that WGGB and WSHM (and WFSB by a certain connection) would no longer be connected, though they would remain as sister stations.
Let's say this does happen... what are Gray's future plans for WSHM-LD? An introduction of YET another local news department in Beantown? I mean, sure, but it's VERY saturated. WBZ/WSBK, WCVB, WHDH/WLVI, WMUR, WBTS/NECN, WFXT (which itself almost airs news 24 hours a day, both live and repeats!), and that's only in English (we had seven at one point until WBIN gave up too quickly). That's six in total with this possible seventh addition from Gray's WSHM? My oh my.
Even if Gray wanted to expand to Boston (my unofficial fourth home market), one... it still wouldn't have a full Bay State presence because you're still missing Providence/New Bedford (my third home market), and that market is already ruined by evil corporations, and two... good luck launching a new news department in a market already oversaturated and still has loyality to either 4, 5 or 7 (or even 9 for those in New Hampshire) since 15 and 25 are still way off in the ratings.
This is just my two cents, but it will be very hard for Gray to break through in Boston with WSHM when there's enough loyalty for other stations already in existence for decades.