I can guarantee that Disney will still market materials of Kermit and Piggy as a couple in products etc. The point is that they don't have the same sort of relationship as Mickey and Minnie. They've always had a hysterically contentious romance (that was mostly one-sided on the Muppet Show).
I keep reading all of these silly comments on YouTube and across the web where casual fans are freaking out about everything from alcohol references to sexual tension. The Muppets have always had this! A lot of their humor was pasteurized after Jim died and I guess a lot of fans grew up with these safer post-Jim Muppets, but I'm glad they're going back to their roots and moving forward from there.
I don't want the Muppets to be safe. I don't want them trying to hard to be "hip" either. And I think what we've seen so far has handled everything pretty well. As for the "what if" pessimism, I won't engage in that. There are some people who will always find something to be upset about or to pick apart (that will probably never happen anyway).
Many fans measure the Muppets in a "what would Jim do" sort of mindset. I challenge these same fans to also take on the positive, can-do attitude Jim had when watching this new stuff. We certainly don't have to like everything. I don't like everything the Muppets have done nor do I like everything Jim did with them. He wasn't perfect. The Muppets are best when they're experimental and that requires falling flat sometimes. What I hope is that some of the naysayers will stop complaining so much and take a leap of faith.