I highly doubt there's going to be any serious boycott of Raw because of Big Johnny. I can understand if people aren't into the guy, there's no pleasing everyone, but any talk of any sort of boycott is yet another example of internet fans talking out of their asses, taking things far too seriously and just in general need of some sort of life. If some people are taking this that seriously, then I suggest seeing a therapist because they've clearly got some far deeper issues going on.
If someone actually did want to boycott Raw, the Attitude Era saw some much more legitimate reasons to do so such as the infamous Katie Vick angle, Val Venis getting his penis chopped off with a katana via a Japanese wrestling faction, The Undertaker hosting occult "blood sacrifices" while speaking in tongues, etc. These are examples of ludicrousy and callous disregards for any degree of taste or dignity. These were legit examples in which I could see people being pissed off enough to boycott Raw, but not just because of a heel character that some might just not be into.
As far as Big Johnny goes, the guy's grown on me. It's something of a different take on the on-screen authority figure that we haven't seen in a while. We're all used to seeing the over the top antics of figures like Vince McMahon, Eric Bischoff, Hulk Hogan and a few others that it took a little while for me to get into the guy. I'm sort of burned out on the portrayals of Vince & Eric. Some aspects of Big Johnny reminds me of authority figures you see in films or tv somtimes that are extrordinarily uptight, self absorbed, completely uncool but honestly have no idea just how hated and despised they actually are. They truly think that they're cool or are some sort of visonaries that it makes them very easy to cast in the role of a villain. It's very easy to dislike someone like that and it gets only easier when you make their primary adversary someone that the audience loves, such as CM Punk and Triple H.
As far as Teddy Long goes, I think he'd be alright if they just did away with the whole Aksana stuff. All the sexual puns were slightly funny in the beginning but not so much now. Thankfully, their segments are usually extremely short so I really don't have any huge complaints about them. One thing I do like, however, is that Teddy Long is no longer the spineless turd that he used to be. He's not the sniveling little snot that Drew McIntyre made get on his hands & knees to apologize ot him and I like that. It's not revolutionary, it's just logical and you'd be surprised how often being logical is simply enough. Teddy Long is supposed to be in charge of SD! after all, so actually having him behave like someone who is in charge is actually a novel idea.