We should not expect that all sports activities are going to start in a month.
There will be needed more time in order to let teams get trained and be on fit again.
Most of the teams cannot train their players right now and this will have a negative effect ot their performance.
You are right on that, but I am sure if the seasons resume we will see some tight schedules with games almost every three days. Honestly I doubt the national leagues will care much about if the players are fit or not. If there is a certain timeframe in which the season could be finished the games will be played. But you are right, it will take some more weeks until we can think about resuming the leagues.