No disrespect, but if 151 had more than the main event that drew they'd still have a card. I feel horrible for everyone involved as this was avoidable.
Because this card was watered down in terms of draw power (not talent. There are very talented fighters on this card), the entire thing hinged on one fight. If the past has taught us anything is that injuries can and will occur in training.
This is a horrible look. It makes it look even worse because it was avoidable by putting more star power per card. 
There is no way to come out of this not looking like boxing. One fight worth paying for per card.
Regardless of how true that statement looks, that's the way the come out looking after scrapping an entire card over one fight.