The heat on him is particularly because of his views on politics as he is a strong supporter of Donald Trump and that's a sentiment not shared by many in the locker room. The heat on him is nowhere near the heat on Enzo Amore (click here for more on that story) and Cass is someone that has the support of management and his size and look will allow him more chances to break through as a top star.
Also, having heat with talent in the locker room is not going to hurt his push. Linda McMahon is part of the Trump administration so being a Trump supporter might actually be seen as a positive in the eyes of Vince McMahon.
The promo he gave on Monday looks to be the start of his ascension up the ranks. Although he is still green in the ring, I give him credit for cutting the best promo of his career last Monday. The match with Enzo Amore appears to be "one-and-done" as they have already begun a program between Cass and Big Show. In fact, Enzo was nowhere to be seen on Monday night. Although Big Show was the aggressor in their first face to face confrontation on last week's episode of Monday Night Raw, Cass will probably win in the end since Show's contract expires in February and they have big plans for Cass. In recent interviews, Cass has been saying that his goal is to eventually be in the main event of a WrestleMania.