I ran a Dragon Age campaign that went from level 1-18, so I can appreciate concerns about game play suffering at later levels. That said, my campaign used rules that were a hybrid of DAGE and Fantasy Age, so the campaign avoided some of the pitfalls at higher levels.
I don't own Fantasy Age 2. From what I'm reading here, it seems like FAGE 2 with the missing features from Modern Age's modes, would be a decently GMable and playable game. I was skeptical that a +1 Defense bonus at levels 12 and 16 for Modern Age's Pulpy mode was enough to stem the high tendency towards auto-hits. While +1 Defense bonus at level 4 and 8 seemed reasonable, I'd houserule it as +2 at later levels. If FAGE 2's focus play mechanics and linked attributes for martial fucuses are the same as FAGE, I'd probably make those adjustments to level 11 and 16 Defense bonuses as well.
For HP bloat, it seemed that GMs that used the houserule of halfing the results of the DAGE or FAGE fomula, were happiest with how their combat encounters played out. The adjustment to HP in Modern Age's Pulpy mode seamed resonable, but the Gritty mode seemed a bit extreme. Could see it beinng doable for certain genres though.
I never did buy the FAGE Companion, so I'm curious if it contained anything like Modern Age's optional modes?
Having bought the original Dragon Age boxsets, FAGE and Modern Age and no longer doing much with the system, I'm not really looking to buy FAGE 2. I'm curious though, so I'll follow this thread.