The most obvious was of course to look at 'flavor' items that are otherwise useless and lacking of value. This would include removing things like the Stone Club or Rusty Red Light Dagger, which have penalties that make them undesirable for use by even starting characters. However, I kind of like the flavor they add to the game-world with the descriptions they posess.
In my own opinion, the current system practicly forces most casters to take the eschew feats in order to be able to function at their best, especially at higher levels. I play a sorcerer/rogue with one character. Though initially I tried hard to forego taking the eschew feats because I wanted to take feats that would make his castings more potent instead, I ended up taking the eschew feats anyway.
Why does it have to be three feats? Still spell, which eliminates the somantic component is just one feat. Silent Spell, which eliminates the verbal component is just one feat. Why can't Eschew Materials be one feat? It might be more tollerable that way. Though I suppose then we'd have to prepare our eschewed spells as X levels higher to maintain 'balance', and who would want that, right? Now if Still Spell and Silent Spell had three tiers like Eschew Materials, and didn't require preparing the spells in slot of X levels higher, than that would be just as balanced, right?
I think that is the design/purpose of the spell components and eschew feats. It is a pain to gather the spell components so that is why a lot of spellcasters pick eschew feats. Imagine a cleric not taking eschew feats and being able to purchase "charges," that cleric now has 3 extra feats to pick from (instead of eschew I, II, III). Some will say clerics will be overpowered because those 3 extra feats will enhance better combat (or whatever). Or wizard/fighter combo. Instead of eschew feats, the wizard/fighter combo will have 3 extra feats for whatever. And in your case, your sorceror/rogue combo gets 3 extra feats for whatever. In short, I think the system is there for balance. The spellcasters have to sacrifice 3 feats so that they can be better spellcasters.
In addition, consider all the spellcasters who already took Eschew I/II/III. I guarantee that they'd all want rebuilds for their suddenly far-less-useful feats... again, a non-trivial task.
From an implementation viewpoint, I should point out that reconfiguring the spell hook scripts (and 2das, and anything hardcoded into the spellscripts themselves) to _not_ use material components would be nontrivial. In addition, consider all the spellcasters who already took Eschew I/II/III. I guarantee that they'd all want rebuilds for their suddenly far-less-useful feats... again, a non-trivial task. Personally, I rather like material components. It reminds me of days around a kitchen table, with my wizard going into town to pick up components. *chuckles*