While the petition garnered some interest, I don't think the usual Bandai Namco staff like Edwin, Isshak, Joseph Walsh etc are in a position to comment on it yet.
Ultimately, they are still a business and it's up to the higher-ups to make a call on that. They can't possibly announce that the Cyber Sleuth game will be coming west as soon as it crosses the 50,000 signatures threshold.
You can get people to sign, but how will it translate into actual sales? The upcoming Digimon Arena game might just be Bandai Namco's "experiment" or "barometer" about Western interest in the series, as much as I hate it (since it wasn't quite what we requested for). It might very well be the Yakuza Dead Souls (which kind of bombed in the West and hence, why SEGA decided it wasn't quite worth the effort on bringing more Yakuza over)
Cyber Sleuth might very well depend on one of the bigshot in Bandai Namco to bring it up during a meeting. For example, Tekken's Harada-san was quite forthcoming when he revealed to fans that he's proposed for Project X Zone to be brought over to the West.
While totally unexpected, it goes to show that Digimon fans can let these producers know of their interest as well. Who knows? Maybe they are looking at the sales of Digimon Rumble Arena first, or maybe someone might propose Cyber Sleuth during another meeting.
It's coming out in 2015 for Japan anyway. Maybe the timeframe just isn't right for them to announce anything yet. They could be still at the planning stages or something (if a localization is already confirmed)
Still very glad that Project X Zone paid off for Harada's decision to propose it...think they mentioned it sold 10x their expectations of sales in the West? Granted, it was quite a long game, but the fanservice (VALKYRIA CHRONICLES 3. SQUEAL) provided by the game was pretty satisfying for me.