I'll be able to see the opposing teams feeds yes, but I won't be able to see the Dodgers broadcast if DIRECTV doesn't pickup the channel. And that doesn't guarantee I'll see every game either, but more importantly I would like to be able to hear the home team(Dodgers) broadcast.
I only activate my DIRECTV service for 6 mos every year during the baseball season and each time I subscribe to MLBEI in order to see the Dodgers play. If the Dodger's channel is not even on DIRECTV it removes the biggest incentive I have for keeping the service active. As far as I know, DIRECTV is the only provider that has the full slate of MLBEI games(maybe Verizon as well), I know for a fact AT&T U-verse and Comcast, which are my only other choices, do not. Comcast's offering in the SF bay area consists of a pathetic 2 channels and it's a complete crap-shoot as to what teams will be on.
We have gotten sports on out of market packages when the channel is not on. It lessens the chance of any particular game but it would not be unprecedented for the dodgers broadcasts to be on EI without the channel being on.