We've been discussing the level 75 tier as well. We did make a change to Vigilance not long ago with the intention of making it a bit more attractive compared to Safeguard, but we do recognize why Safeguard is considered so necessary. We'll discuss some more.
Personally, I think we should gain a root break baseline. Something on a 30sec CD that removes snares and roots(obviously). And then remove it from Safeguard and adjust Safeguard accordingly. This would open the tier up with out having to buff the other two talents to Safeguard's level.
Safeguard could easily be adjusted to be on-par with the other ones. Such as buffing the duration of the DR, maybe lowering the CD on intervene, or upping the DR buff.