Yes, there is always some risk, but I think the risks are greatly over stated. Segwit is Segwit, they just changed how it activates and increasing block size has been done in countless alts, so this is not something radical. That would also not happen till November, if it happens. Segwit has been the sticking point and that looks like it is going through. 2-2.6x more capacity, so a lot more users can use BTC at once.