Hello there!
I don't know if you're playing on the elyos or the asmodian side of Tahabata.
But playing myself on Tahabata-Asmodian, I don't feel exactly like you, at least not at the moment.
Population on Tahabata :
It is true the current population on Tahabata is lower than on Atreia. Judging from people in raid, the population on Atreia is around 1500vs1000 (Elyos/Asmo) when it is around 600/450 on Tahabata. From my raid assistant, there is always 25-30 new names on each raid (both side included), so population turn over the days. And if you take into account people not coming to raid, I believe you can add 20-50% of population easily.
World PvP :
From what i'm already seeing on Tahabata, I believe fusing serv will turn PvP into zerg-land. People already complain about getting 6v1 then 12v6 when some fight appear in front of the fort, I can't imagine how it explodes on Atreia.
Raid :
When merging can be a huge plus on PvE, in my opinion it will be a malus on RvR.
Raiding with 500 people or raiding with 1500 people leads to really different results.
When it may sounds better "more pvp, split tactits, more strategies" and so on, it also means doors/dux doesn't last more than 2min, when they last for 5-10min on Tahabata, allowing people to come back for a second / third try on PvP.
Also, except for the divine, every fort can be taken down on Tahabata. The divine cannot be taken down as long as one faction doesn't fully give up on it, yet maybe this can change when everyone will reach their 55.
Economy :
When I chatted with some Atreia Asmodian a bit before the 2.0, price on both server were around the same (we compared some stigmas, balaur blues scales, some pots/scrolls, enchant stones).
Fusing won't lead to an issue on this point, but it also means both server are stable as they are (when a server starts to die, prices go up).
PvE :
I can't let you say that high-level activities is dead on Tahabata (at least on Asmodian side). it is true it's easier to find those activities if you're playing Chanter/SM than sorcerer or ranger, but this has always been true on every serv.
it's also true that you'll be more successful in forming a group at 21.00 the Friday or 14.00 the week-end than at 9.00 the monday.
But yet, if you build your group on LFG, there are people applying. Maybe not much yet, cause Tahabata is known to be a chilling server compared to Atreia (yet we had 2 people lvl 55 less than 24h after the release), but people will end up being 55 and do their BT as well.
Personal conclusion :
Merging doesn't seem to be necessary today. Server are just different, some might prefer low population server to recognize names when they go out, not to feel overwhelmed by the number every times, and some might prefer the constant and faster activities and try hard a bit more about things.
