They'll still only put three episodes on each disc, so you have to buy the big box set for $99.99, and then go change the disk every couple of hours during a marathon.
Then I'll still not buy it.
If they want my business, they'll have to give me what I want at a price I'm looking for.
The only reason to "still put three episodes on each disk" is if it is re-mastered in such a way that it really does fill up the disk after less than 4 episodes AND that the benefits of re-mastering (higher definition, etc.) are valuable enough FOR ME to go with the newer format rather than the older, more-devices-can-read-the-disk, format.
Here's an example:
Suppose some 4-part movie series was filmed in 70mm in the 1970s but when the DVDs came out they just made it "DVD quality." That's 4 disks. Then they put it on Blue-Ray.
If they put it on just 2 platters, that adds value to me.
If they remaster it in 1080p and it takes 4 disks, that adds value to me.
If they put it on 3 or 4 platters but add lots of extra stuff, that MIGHT be valuable to me, but if it isn't I will stick with the DVD version because it plays on more devices.
If they just put the same files on Blue-Ray along with maybe some ads, I'm going to say WTF??? and get the DVD version instead.