It locks a country out for a year and zeros their influence. This would be less of an issue if there were options to harass the influence of the SOI power OR if the influence cost were raised.
If the cost were raised to 100 from 65, it would be possible to outrace the IHolder to the top. The IHolder could still defend with Discredit->Embassy Lockout even if they do not detect the attempt until the competition is halfway to the SOI kickout of 100. Since the competition cannot Discredit etc the SOI holder, this seems fair.
Anecdote:
Attempting to unify Italy as Savoy. Successfully booted myself into GP status through industrialization and prestige wars. Kicked Austrian SOI out without too much trouble through combination of war and SOI. The remaining country is Papal States, on which the French have an SOI from the beginning. Attempted to pull an SOI coup on it failed. Warfare with French was unsuccessful -- beat them up fairly badly, but overwhelming numbers, dropout of Austria as ally and the ending of the Prussian intervention in Alsace led to an eventual SQAB.
Minor annoyance was that France could unload troops into Sardinia despite ongoing naval combat.
If the cost were raised to 100 from 65, it would be possible to outrace the IHolder to the top. The IHolder could still defend with Discredit->Embassy Lockout even if they do not detect the attempt until the competition is halfway to the SOI kickout of 100. Since the competition cannot Discredit etc the SOI holder, this seems fair.
Anecdote:
Attempting to unify Italy as Savoy. Successfully booted myself into GP status through industrialization and prestige wars. Kicked Austrian SOI out without too much trouble through combination of war and SOI. The remaining country is Papal States, on which the French have an SOI from the beginning. Attempted to pull an SOI coup on it failed. Warfare with French was unsuccessful -- beat them up fairly badly, but overwhelming numbers, dropout of Austria as ally and the ending of the Prussian intervention in Alsace led to an eventual SQAB.
Minor annoyance was that France could unload troops into Sardinia despite ongoing naval combat.