Current Parliamentary Composition before 16th September

BN, the current ruling party, only holds 63.06% (140) of the total 222 seats in Parliament while the Opposition PR commands the balance at 36.94% (82). In order to wrest control of Parliament, hence the Federal Government, the People's Front (PR) would need a defection of at least 30 MPs from the ruling BN party to reconstitute the composition to 112 seats (50.45%) of PR against 110 (49.55%) of BN for a simple majority.
Short of the required two-thirds majority (148 seats), the new PR government, if ever formed, shall NOT be in a luxury to revoke or amend existing laws nor legislate new ones. So what would be the benefits of the planned "regime change" by Anwar Ibrahim to the ordinary people at large ?
Under the collective PR banner, PKR currently has 31 seats, DAP has 28, PAS 22 and Independent 1. Going by an ethno-religious classification, the PR is represented by 43 Muslims and 39 non-Muslims while the BN at 89 and 51 respectively. Will the composition change drastically as a result of the defections after 16th September so as to substantially misalign or unshackle the Malaysian power structure for good ? Is that what Anwar wants in his political adventurism vis-a-vis the Malay-Muslim majority in the long terms ?