In terms of Ace Attorney Activity lately its been at its highest its ever been. First we get GK2, then the news and evidence of the AA movie then the announcement of the AA Vs Layton crossover, and finally the re-emergence of GS5 (possibly if localized AJ2 or maybe something completely different. we dont know yet).

So in terms of fandom we are buzzing with anticipation. But that all grinds to a halt when you take things into consideration. for example:
1- GK2 has had NO mention of a western localization despite the great praise and reception that GK1 received and the overall western success of the entire series .

2- The AA movie is no doubt gonna get seen by audiences across the globe thanks to the internet, but unless officially announced were only gonna get poorly translated subs of the movie, or poorly dubbed fan edits. (hoping that there is an official release, even if it is only subbed( even an official english dub would be awesome)) hee hee what a lucky guess.

3- The crossover game, (even though definitely possible of a localization) will be quite a wait for us, and its place in the timeline and if it is canon or not is highly debatable, but since phoenix is still an attorney in it we can safely assume that it takes place before the gramarye trial) . Plus we have the problem of the GK2 situation of if it will be localized in the first place.

4- probably at least a 1-2 year wait for until even Japan sees GS5 finished and us even longer. (short but self explanatory)

5- (cannot remember who said it :P sorry) but if this is the end of the main series then we have little to look forward to after these are all released. Following the hypothetical scenario that each series is going to be a trilogy then what does that mean for us?
GS1-3= phoenix trilogy
GS4-5(6?)= apollo trilogy
GK1-2(3?)= Edgeworth trilogy
(Im not counting the cross over because its unlikely that phoenix-layton will get a series of their own)

If we go with this theory then it only means that we only have (GS6- AJ3) and (GK3-AAI3) to be released until all trilogies are complete (At least in Japan), and then the series has to either end or start anew with a whole new set of characters either after the AJ ark (meaning phoenix will be old or not in it at all) or before the time of Mia (to avoid chronological problems.) Thus either erasing or rehashing old plots and characters.

Sorry if i'm being really cynical, but this is the reality if the series is going to follow the pattern of trilogies. BUUUUT as i said this is only a theory, who knows, from events that happen the series could expand further on past issues from either series as well as subtly intergrating new characters into the series who could be the new protagonist.

One plot device that the series could intergrate, similar to GK2, is to have a rival defense attorney whilst retaining the frienemy relationship with the prosecutor.