I reckon three things could happen next year in relation to our tanks (not taking into account our RPG):
1. Moskurg neglects their tanks. If this happens, we increase our armour presence in the Jungle and advance further, despite whatever they bring to the field (including the theft of our grenades). In the Desert, we'll steamroll them up until the point where we get to their cities. We'll likely get stalled here as the citizenry is well-armed, we lack a CQC primary weapon, camouflage is significantly less useful here than in the Jungle, and Moskurg has home field advantage.
2. Moskurg revises their tanks to be cheaper. The armour fight continues to be even. We'll have been able to continue moving forward, but Moskurg has developed some new advantage. The fighting stalls at best and we lose ground at worst. In the Desert, we'll likely get stalled but there's a chance we could make it to the cities. If we do get to the cities, we'll get stalled for the reasons mentioned in Possibility 1.
3. Moskurg designs a new tank, just as expensive as ours and overall better than ours. Their armour advantage overtakes us in the Jungle. We lose ground. Their ability to fight us in the Desert greatly increases. By virtue of our tank destroyers, we manage to stall them, though getting pushed back is a very real possibility.
Next turn, we'll have to do something that can combat new tanks. Revision is a possibility by revising our planes to be more numerous or by modifying our T25's turret (making it electric) and cannon (adding a muzzle brake).
Alternatively, we could use the Design phase and go for a more ambitious tank, adding a better turret+cannon, spaced armour, shaped armour, faster speed, and hydropneumatic suspension so it can fire accurately when moving.
These are just some ideas and I'm not pushing for anything yet. Well...we'll definitely need a primary CQC weapon if we want to start taking Moskurg cities but I don't think I need to argue any more on that front.
Glory to Arstotzka.