The better a given product does, the more value there is in entering the same space with a similar competitive product. If linzess tanked or had marginal uptake then I would worry about the future value of SGYP. The better IRWD does and the larger the market they can build for Linzess the more valuable plecanatide and SGYP become!
Betonbio is 100% correct.
Buy you guys should not entertain doom king. Yea, he got my feathers rustled too when I came to this board, but after a couple of his post he becomes very transparent and not worth entertaing.