I'm sure teams will figure out a way, maybe just loosen your arms a bit and slid down to their legs, or something like that.
In any case, it's not like players were making hip drop tackles every other play.
Rules change, some aren't quick to catch on. Years ago, while one of my kids was in youth football and the coach was talking about tackling, one of the parents jumped and tried to tell the kids the way to tackle was like he did in school (which was probably 20 years before. Like putting your face directly into the runner's chest. Well of course these days kids are taught, rightly so, to hit with your shoulder pads, so as not to have sprained and broken necks on some skinny kid with a neck like a chicken bone.
Things change....