The current system works fine.
To paraphrase Mick Jagger, you can't always get what you want, but you ALWAYS get what you need.
The bolt action is, on most maps, perfectly useful. If you're a Russian player on a late war map, you've got THREE to choose from, and the M44 is probably the best of all worlds since we really don't have infantry engagements at ranges where the longer barrel on the 91/30 makes a difference that often.
Are other weapons easier to use? Sure. The semis are the best weapons of all, especially the SVT-40 (bayonet, rapid fire, accuracy, high magazine capacity). The STG44 is the ideal compromise between a full longarm and an SMG.
The thing is, the sniper rifle and MG are NOT uber weapons. It all depends on the situation and how you tend to play. If you just want to sit back and plink away at people instead of capturing a position, then sure, the sniper weapon is ideal on a map where you can do so largely unmolested. But there's definitely maps on which the sniper is NOT ideal to my personal playstyle and I'd much rather have a semi auto or boltie. Or an SMG.
It's all situational, really. But that's why the current system works fine. People can learn to use the bolties. I think people just need to get over the sniper fetish.