Now that you bring it up, I think I can mention that I was considering lowering the LA of the template to +3 or lower. I'm not entirely sure it's power is worth the 4 level loss for the template itself.
They don't get some of the more powerful aspects of the template anyway, like the spell resistance or the mode of movement that is rarely given(burrow) and replaced with something that can be easily attained(swim speed). Not to mention the template doesn't give any bonuses to ability scores like other +4 LA templates we know well.
All things considered this isn't really an incredibly pro-caster template, except for the fact it grants you easy escape from a potentially deadly scenario(if they don't have a fireball prepared).