Terrible Idea to increase tactic space
You are already discouraging players to attack poorly upgrade or lower age bases in the first place. You don't want to touch same age bases with proper upgrade and layout because you get much more out of attacking 3 weak bases without losses rather than waiting 3 hours to attack a solid base with all your tactics,merc,blessings and ally troops.
In WW, you are forcing people to fill their roster with GA and above since you are already forcing lower level players to pack at least one sabotage for TC to stop them spawning field howitzers and Like I said above, you need all your tactics,mercs,ally troops to 5 star a same age base that is properly designed and upgraded.
You should be encouraging the players to challenge more difficult bases even it takes lots of time to restock what you throw at those bases, not limit the players from attacking any base that pose a challenge.