Ah definitely agree there, the BN games need a collection badly (at least of the first 3 games).
One issue I see on why Capcom is hesitating with releasing a Battle Network Collection is the fact that ever since BN3, all main games have had 2 versions(BN5 has 3 versions if you count Double Team DS). With BN and BN2, those games didn't have 2 versions. Meanwhile with the later games(that isn't BN4.5), you have:
-BN3 White & Blue/Black
-BN4 Red Sun & Blue Moon
-BN5 Team Protoman & Team Colonel
-BN6 Gregor & Falzar.
So if you count all versions, a Battle Network Collection would have 10 games, 13 if BN4.5, Battle Chip Challenge and Network Transmission are included and 14 if Operation Shooting Star is included. I mean, already that is way more compared to past collections, with Megaman Anniversary Collection having the main 8 games and the Power Fighter games.
The other issue I see with them hesitating on releasing a Battle Network Collection is the fact that in Battle Network 4 through 6, you have Django, Otenko and the Gun del Sol from Boktai appear in those games. And the Boktai franchise is owned by none other than our favorite company Konami.
Either way, I would still pay for a Battle Network Collection if it ever happens. But do you know what I think they should do? Remake Battle Network 4.5 as it's own full-fledged game. 4.5 is unique in the fact that it was the first game before 5 & 6 that it introduced multiple playable Navis, including Bass.exe. And look at how many Navis were introduced in later games. The only thing about 4.5 that wasn't exactly the brightest was not being to control the Navis and only being able to handle the Chips.
Seriously, there's so much they could do with remaking Battle Network 4.5. Not just by allowing the player full control of their Navi, but also by adding many more Navis for the players, adding newer mechanics into the game, like the changes to the Navi Customizer, the new Element Strengths and Weakness to Sword->Wind->Cursor->Break->Sword and make Megaman.exe's Soul forms into choosable forms, like how you can turn Bass Soul on and off in Battle Network 5, etc. I feel like there would be a whole lot of potential for remaking Battle Network 4.5.