If they take good suggestions about story and gameplay, you know, actual, logical ideas, and develop on them, then this will work.
But it won't be what this will lead to. Bioware will read the suggestions, and anything that people criticise, they'll rip out of the game, instead of trying to improve on certain elements or mechanics in it. Along with that, they'll market it to everyone, losing their core demographic, and however well this game might sell, we all seen what happened to DA2, in that the DLC got two major spins and they both fell flat essentially gutting the future DLC plans they had for the game.
People can say whatever they want about Bioware games nowadays, come up with petty insults or pathetic, apologetic excuses for what they've released, simple fact is, they're not sustainable anymore. ME3 would have been a train wreck in it's revised for had it not been for the MP, which is only making money of microtransactions now, DA2 crashed and burned in terms of long term usage, TOR has gotten more than it's fair share of people who ran from it. Fan suggestions won't do shit because while they're criticising the game, they should be criticising the developer for their less than stellar approach to improving the quality of their games.
Here's an idea: lean towards a more refined version of Origins and Awakening, maybe fuse the two together, cut out the unnecessary shite, *cough* mages tower *cough*, or refine it to a more easily-managed form, and retcon the second game's storyline making it about a war between Flemeth and Morrigan. I keep saying it, but the title refers to the age that began with freaking dragons returning, let's investigate the reasons behind that before we jump the shark to mage/templar/rest of world relations.