Dynamic points are interesting, and as long as non-PvP events are given enough point to go on-footing with PvP events, I think this could be fairly interesting if done right but will reserve judgement for the time being.
Here's a potential problem I'd like to throw out there: Guilds can result in people forming into small internalized circles (especially likely on a small forum like this one), which in turns means help/knowledge/etc... may be less openly shared and may promote more fighting/flaming and drama due to that increased split. (To compare, Card Ideas and Art has gotten notable mockery over the years as being a "useless section" by non-card designers.) What steps would be taken to prevent this kind of hostile environment from forming?