While I understand the sentiment, but it seems like you have already come to the conclusion that the OTs will have feet stuck in cement. I am not saying they will be all world but the coaches and GM stuck with these guys so it's worth letting them get a fair chance before saying that they can't hold their blocks. Never seen Bell at LT so lets get through a snap or two prior to passing judgement.
They deserve their shot, I agree... but it's common knowledge that both are probably not long term answers for the success of this team we probably shouldn't treat them as such. You can only give a guy so many shots until you realize it's not going to work out.
I will say that Bell is more than capable back-up.
As for Chandler, the jury is still out on him. He's severely struggled at times and he's been positively good at others. I withhold judgement on Nate until more film is present.