Well this is the problem isn't it. We all know VC getting ported fits the Sega- console to PC ratio pattern that they have been doing for years. There's something obviously VC related happening due to the VC pc game and VC content DLC for NOVA being available in the same time/month...and we know VC started to be ported before this campaign started. There's nothing to suggest that Sega will have learned anything because in their view point they're doing something they've always done. While its took soon to say what the impact for VC is..i feel it must have been considerable because of the fact that they released a PR statement. Sega only does that if a title took them by surprise and they were pleased by the results...that's what happened with SONIC GEMS COLLECTION..or one of the genesis collections for consoles...That's what happened with GBA version of SHINING FORCE remake..which led to other SHINING FORCE games..and the series crapness..and i'm sure it happened with HOTD 2+3..which led to other HOTD titles and the eventual HOTD4 port.
Now its VC..so something will happen..some of the titles it beat in the top five in the USA alone were selling big numbers..so VC sold a lot... be it a new game which i think was going to happen anyway...but some ports of certain Console titles from Sega.
I actually think that what you're suggesting is fairly likely also. if something isn't already in the early stages for VC, more discussions are being had about what to do next for the franchise, although the latter is probably more likely I think. My guess is that someone within Sega has brought up making a new full-fledged Valkyria game and, seeing as this would be a controversial move because of the investment, talks may be stalling. But at least it's that, instead of what we might've assumed in the past based on the relative inactivity outside of VC Duel: a moratorium on the franchise.
Besides the VC stuff you cited, there is a Valkyria team in Dengeki Bunko: Fighting Climax. Valkyria II was supposed to be a Playstation TV (western version of Vita TV) title but for whatever reason it's been pulled.
As for the Shining series speculation, well I would've just assumed it would continue going because even if I don't know how much money they make, Sega continues to make those games on a regular basis. And since Blade Arcus was made, which on some level celebrates the newer era of Shining by using characters across the more recent entries, it seems like Sega would be confident about the franchise.