I do agree, I think that Silvers should team with silvers. last thing a bunch of angry climbing League-rs need is someone of lower elo in the wrong lane, which adds even more credit (in some people's minds at least) to the whole "It's not my fault, my team's trash, look at my team they're all B2 and I'm S3!" in order to climb in ranked at the very least do not put people who are not in promos in with higher elo people, and then only with the bottom of the barrel of that elo.
That said I would still only have promo silvers fight other silvers. This because if they are better than everyone else and get moved up and are creamed? It's a clear indicator of their need to improve... of course there are many players that are deluded or will just give up... but that is why I think more motivational stuff should be in the load in screen and even on their channel, people who talked about how they discovered the one or two things they needed to get down first before they could climb, that way, anyone who is serious (or in many cases, OVERLY serious) will at least give it a shot. I think improved and more frequent game play tips (stuff that has to do with the champion and role might be helpful, or stuff that has to do with the opposing champion) would increase player performance quality overall.