The only thing i am sure of is that the ltc/btc ratio will be once again in the 0.048 region. Probably in one or two years.
I originally followed the chart by ronfkingswanson, but it looks like as he did stop watching it himself. LTC is currently undervalued and i think it might be possible that it will devaluate even more through the time, when bitcoin gains strength. But as soon as the next bitcoin bubble hits it's old highs, things are going to turn.