I would like to suggest a huge and revolutionary change - total rework of invulnerability skills. Invuln in WvW is the most OP defense, regardless if it is full invuln, warrior's endure pain style 0 dmg or mesmer's/thief's evade spam. The biggest issue with being invuln is that it scales infinitely, you can tank 1 or 100 people without any difference, because you simply cannot die for the duration of the skill. Another is there is basically no counterplay, blocking another defensive skill can be worked around with unblockable skills, but there is no way to go through invulns.The suggestion would be to replace all the skills that grant invulnerability with ones that grant barrier, it would still make you survive a lot of pressure but you couldn't just walk into danger without any thought and ignore all pressure.