i would actually need to sit and calculate the new profitability index to figure out where our stable price range is..
Using only block rewards to calculate price is a recipe for panic.. Doge has a difficulty about 141 times more than noble.. which means there are more ppl mining it.. more ppl trading it... and more ppl wanting it.. so even if NOBL block rewards are 100x times less than doge.. you would likely get less coins mining doge than NOBL in a 24 hour period.
BTW.. as we have all noticed a slow increase in value of BTC i would advice the community to expect a slow down in ALT coin trading.. if its a slow steady rise.. there wont be instant liquidation for BTC to be converted to FIAT and its effect should be minimized... but if you wake up the next morning to find BTC trading above USD 1000 on all exchanges.. then you can expect an immediate drop in prices across the board.. At which point.. i would advice you to go for a walk and not entire the market until btc value stabilises..
The altboom started before Christmas and Noble was launched Jan 7th