How could they adapt sailfish to a tablet? Such a big display does not go well with gestures, all apps would need a new layout.
I don't knot about sold units, but as Jolla sill exists it should be fairly profitable...
However, adapting tablet layouts is probably not the next point on Jolla's to do list, look at how long it took Android to go big.
I think it would be best for Jolla to offer a phone with same size (optimum for gestures) and compatibility with TOH. A safe bet: more fluid design (rounded corners like the teaser-corner), a bigger battery... I see no need for the fastest processor, better at some RAM.
This is what I would work out:
Snapdragon 410 (plus adaption of 64 Bits in HAK)
3GB RAM (two would be enough as well)
2500 mah.
Nokia Camera...