Okay, I'll give this a go. I mean no offense. Maybe the hilarity is in the unexpected. First, intuitively, it doesn't seem as safe. You say it's stronger than glue, but the idea of having adhesive-backed velcro is to be able to attach and re-attach the velcro. If the glue on the back of the velcro were designed to be stronger than the velcro itself, than it wouldn't work as intended. It can be difficult enough to get a tire onto a rim without the velcro in the way, so it seems like it would be a very tight fit with the added thickness of the velcro (maybe helps keep the tire on the wheel) and would be difficult to install without moving the velcro off center. IMHO, some things are best left to tradition and tried-and-true techniques, and I believe gluing tubulars is one such example.

P.s. Also, I would also assume that it would negatively affect the ride quality since some of the road feel is dampened by the velcro. Might even make the bike feel sluggish? Also, one of the main advantages of tubulars is the weight, but this is reduced by the added weight of the velcro (I know, not much, but it's there.) Lastly, in order to start a race, your bike needs to pass an inspection; velcro'd tires would not pass an inspection.