Can't say I disagree with that assessment. I have pounded the table with both hands all the way up to the $7-8 range. I have a hard time recommending buying Ariad at the current 2.5 bil MC.
My basis is somewhere in the low $4's. There is a big difference between me not wanting to sell now and committing new cash now. Besides liking the chances for the two big hitters (534 and 113), I think a buyout offer is a reasonable possibility. Especially if 113 starts to show potential.
This is and always has been a roll of the dice. Anyone telling you anything else doesn't really understand this type of investment.