You will still have no problem hiring all of these mercs in the lands you control, but the enemy's lands will usually be pretty low on mercs.
Every game is different. Sometimes a faction will expand rapidly, sometimes it will build a ton of troops and sit in one region. Most of the time, factions expand well enough. In my current game, the Pahlava are taking over the eastern Seleukid empire; Bactria has conquered most of India; the Saka and the Sauromatae have cut a swath across northern europe; Germania has carved out an enourmous chunk and share borders with the Sauromatae, the Aedui, and Rome; Rome is involved in a bitter war with the Aedui and Arverni for Southern Gaul, and has been for years; the Luso have conquered half of Spain; Carthage has conquered Numidia, the other half of Spain, and is fighting with Rome for Sicily, the punic wars have begun; Ptolies have conquered Syria and palestine; I as Mak have conquered Asia minor, KH, and Epeirus, but things seem to be going well. With Very Hard, if you share a border with another faction, they will almost always attack you. I say almost because I think it depends on the faction. I have shared a border with the Hay for years, and they have not attacked me, even though they have a full stack sitting there. As soon as I shared a border with the Ptolies, they attacked me with a full stack and have two more on the way.
I do not face what I would call a swarm of Mercenaries. I think the AI only buys hem if they think they need to bolster their troop numbers. For example, I have fought half stacks with quarter stacks, and the half stacks contained no mercs. But when I have more men, the AI almost always hires mercs if they can. Sometimes they will send a lone family member at me, and he will buy mercs all the way to his destination and finally attack with a full merc army. There is really no one way that everything happens.
If you go to VH, the campaign will get harder, but you'll still be able to hire mercenaries, don't worry.
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