Gez
In refutation of your point picture this:
Darksun
Every joe blow and his mother knows the difference between psionics and magic.
You are forcing an artificial construction into the mix by saying that forsakers would not distinguish between psionics and magic. While it is possible that they would not distinguish as you say. It is equally feasable that the difference between the two means everything to a forsaker and that his entire purpose is to rid the world of magic to replace it with psionics.
In fact it seems plausable to me that the best forsakers would know alot about magic to know how best to combat it and therefore have ranks in knowledge arcana or some such. Again it is equally plausable that a forsaker would approach psionics in the way [it looks like magic - kill it] as [it looks like magic but is different - maybe I can use this against magic]
Your point is equivalent to saying - we have discovered something new that resembles something we universally hate so lets destroy it. While there are certainly people who will agree to that close-minded fear induced response, there are ceratinly others that might want to study the newly discovered something in hopes that it can provide a good. Think of certain snake poisons - they have been used in genetics to study cancer, and a whole host of diseases. Think, evolution vs. creation. The list most certainly goes on.
If you use psionics are different (this is really the only relevant case) then it just does not make sense to equate a psionic "spell-like" power with a magic "spell-like" power. While they certainly fall under the same category with regards to extraordinary, supernatural or spell like. Psionic powers of the third category are by no means magical. The very language of that third category is misleading simply because it was designed before the psionics was introduced into 3e. All spell like powers resemble SPELLS. Introducing a supplementary rule that adds in a whole new category of powers (pun intended) means that we have to rethink the way we define innate abilities. Really the appropriate terms would now be spell like powers and power-like powers.
They both would belong to that third category. But one would be magical and the other psionic (respectively). If you want to use the variant rule, doing anything else simply does not make sense, regardless if you want to call what I am saying as a house rule or not. If you do not like this point simply because it makes psychic warrior/forsakers powerful, fix the problem, but not by simply saying that psionic powers are spell like, which they clearly are not. Rather, fix it with roleplaying constraints, membership constraints (in order to learn the forsaker abilities you have to join the order of forsakers which have a code of conduct, etc.) Afterall, it seems more than reasonable that there could and would be a group of psionic forsakers especially if there is conflict between psionics and magic on your world (with everything else I have already stated).