And how many of the dockable bases are inside the realm of Taus where 101st plays normally? How many of those will turn red via npc empathy? In reality the only Tau bases will be Freeports in T37 and T29.
You can try to downplay the impact all you want but fact is that a fr5 to hostile against the own idea wrecks that faction. It ceates stupid situations (like: what happened to those 101 families on planets and bases?) and also causes a huge deal of "negative roleplay" that is zero fun for the defeated party and especilly bad when the process thar created the situation is deemed flawed. The combination of no-fun rp, oorp struggling against the ruling, oorp hostility in its wake, and harder gameplay will definitely have a major negative impact and I am convinced it will result in the disappearance of 101st.
"Deal with it" is a tall approach, especially when the means of getting that fr5 material are highly dubious.