deshbhakta nepali , dont joke. Do you see wickets nowadays. So many runs are scored now easily, blowers are seem to toil hard. Run scoring is ridiculously easy nowadays. Every team has few players with average over 50. This thing was rare 20 years ago. You don't need to go back too long. Just see recent Sri Lanka Pakistan series. Both teams made over 600 runs in both the test. 3 double century in single test including one triple.  West Indies- England series was also same. England made 600 runs and west indies replied with 750. Again in next test both England westindies scored over 500 runs. India made 394 in one day match.....and NZ were well set to overhaul that total.  Just few years earlier south africa successfully chased 434 in one day matches.

Cricket is turning to batmans game mainly due to the kind of modern wicket. Even once the Fast Bowlers paradise of Perth- Western Australia is turning out to be slow and low. Barbados once fastest wicket in the world turned out to be a farce with ordinary batsman scoring hundreds.

Secondly , the conditions didnt varied 40 years ago?  Those players used to play in uncovered pitches. Uncovered pitches assist bowlers alot. And by then there were no protective equipments and gear that the batsman enjoy now adays. Another thing is that the cricket rule has been greatly modified now in favor of batsman.