Anyone that truly understands economic and social theory understands that Bitcoin is the only long term guarantee.
That said, the Stellar project is a fundamentally & technically sound with adequate institutional awareness (hype) and thus likely to stick around for a few more years.
Personally, I accumulated DCA style over the last 9 months and will now hold.
MACD bullish crossover
RSI turning bullish
Incoming breakout from descending triangle
MacroMew