 The most serious drawback is that in a long two innings game, where traditionally the team batting last suffers on a deteriorating pitch, there is no real reason why in armchair cricket the fourth innings is any harder for the batting team than the previous three.Perhaps you could adapt the lower-order batsmen rule to make it harder in the latter stages of a game?In real cricket, the bowler styles are varied and important, but there is no appreciable difference in the card game between a fast bowler, a wristy leg-spinner or a swing-and-seam merchant.