"Respect that" and "dump her" are, unfortunately, not mutually exclusive. There are going to be guys out there that will absolutely understand and respect your choice but still decide that they'd rather be with someone who doesn't want to wait.
Sex is a very important part of any long-term relationship, and its absence is just as important. It is definitely a big enough deal that it will send some men packing. That said, please don't compromise your morals for sake of a guy. The right guy for you is going to be totally supportive of your choice. So even if there is someone that is 95% perfect for you but is pressuring you to break that promise you made to yourself, he's not perfect after all.
You're going to have a tougher time than ladies that don't put this burden on themselves, but if you think the wait will be worth it, then you're making the right choice for yourself.