Probably. It would affect their U.S. disc sales. While it may be on Hulu for everyone to watch freely, it still has ads. You can watch it ad free by buying the disc releases.
The situation for HG isn't bad but it's not good. They'll lose money if they buy back the distribution rights from whomever it was transferred to, dissolving the contract with the former-ADV. If whomever has the rights, decides to not produce anymore copies, HG would lose out on revenue, in which case, buying back the rights/dissolving the original contract would be the best for them since they won't gain revenue. There is the option that whomever has the disc rights can continue to honor the original contract. In that case, there would be no significant change to HG's revenue coming from disc sales. Whatever the result, HG does not stand to gain additional revenue from whomever has ADV's distribution rights to RT, Macross, SC, and Mospeada (there will either be no significant change or a lost).
No. This is Hollywood we're talking about. Just be glad they haven't tried to bringing Jem to the movie theaters.