Basically SEGA needs to restructure the studios into smaller teams that make sense. I personally thought the post console restructure (that pissed off talent and made them leave) hurt them. UGA into Sonic? Why?
From 1998-2002 Sega lost a whole bunch of money, partly to having 9 indepedent units making games. Sega has been the most profitable when simply having a uniform R&D structure like any company, and it's not gonna change.
UGA and Sonic Team shared the same producer (Mineko Okumura, left since), 2003 was bad times for Sega, 6 teams instead of 9, lots of fiscal losses. Card arcade games in Japan saved them.