Doge got there due to volume which to exchange operators is a bounty in itself But I do agree more exposure would help the cause along side more trade volume, votes and general value.

One way miners could help is to split their mining, mine whatever's most profitable as well as Noble (in whatever ratio suits your setup) then use a portion of the high value coins return to buy noble this will help maintain/increase nobles value and allow you to stock up on your noble quota. Keeping some hash pointed at noble will also keep the network alive and difficulty up to make sure new comers can see the coin has an active community backing it. Using the other coin to cover power costs etc. also means you don't have to sell on the noble market to cover it further swinging the ratio of buys to sells, at least until Noble becomes the most profitable coin again

If anyone's unsure about mining multiple pools with different ratios feel free to PM me and I will give you a run down - forgive me if it takes a while to respond I often forget to check the message counter... its too small