No, actually we would go at 50ft/120kts, tactically. That was before it was decided that the primary threat was small arms, though.
Considering that the SA-7, the lowliest of the first gens, can reach out and touch you at over 10k ft, altitude isn't the answer if you've got anyone in the back. And you STILL have to put them on the ground at some point.
Yes, I love the Phrog. And I wouldn't be at all surprised to see UH-1Y's carrying six dudes apiece on a raid.
At 50/120, your blue threat of hitting towers and such just went way higher than the threat of getting hit, and your E-M is still not great. Get shot at, what do you do? Go to 5 feet and 125 knots? Upwards manuever and jinking in a helo is negligible. If fast and low is your goal, a V-22 will win. And if I get shot at, I can displace a couple miles laterally, and massively in all 3 dimensions, putting huge distance between me and my expendables.
A lot more variables go into whether a MANPAD can hit you at a given altitude than just the altitude, lets just leave it at that. There are also ways of minimizing signature on the way down. Regardless, a V-22 has way more options against the various threats out there. High/fast, low/fast, and even low/slow, if you're really stupid. A helo can only go so low and so fast. I know 0' is the min alt, and maybe 125 KIAS or so fast.
If you are DM qualified for the 22, I hope that they aren't teaching you to try and run from a fixed wing threat. And your airspeed isn't going to save you from a helo armed with AA missiles.
Here's the rub. I can do any profile that suits the threat. If you're going to tell me that a helo has a really great shot in RW v. FW DM, you're high. A well-trained jet pilot with time on station will always be able to whack an assault aircraft. What saves you is that he doesn't have time and/or ordnance to spend on you, so you try to defeat him long enough that he gives up. More energy is better, and I can still pull tighter turns than him. Against a helo with A-A, I may not be as safe as a jet, but I'm a butt-ton better off than any helo.
I have flown both, and came to the V-22 by choice, and I know which one I'd go with.