If Dash achieves a small market niche with the Dash platform, it could gain some traction, and if BTC returns to highs in the next Bull run, maybe we can hover around $250 and try to stabilize around that area.
According to free market economics it should stabilise at masternode operating costs + a risk premium on the collateral.
Masternode operating costs are around $30 a month which would value Dash at around $5 (based on rewards of 6 Dash per month).
Add a $25 per month risk premium (pretty generous at 600% of operating costs) and you get the stable long term price = $30.