The former Bavarians boss believes the newly-crowned Bundesliga champion will be untouchable in the coming years, while Ottmar Hitzfeld thinks the league has been damaged.
Bayern claimed a historic treble last season under Heynckes before he was replaced by Pep Guardiola, who has gone on to seal the Bundesliga title in record time, with Tuesday's 3-1 win over Hertha Berlin securing the crown.
Heynckes believes the Bavarians have moved well beyond the reach of their nearest domestic counterparts and will prove untouchable for some time under the "excellent" Guardiola.
"They have the best squad in Europe, so also the world," he told Kicker. "I cannot see competition far and wide in the Bundesliga. They have secured a golden future.
"[After 2012] we went in new directions and pledged to absolute top performers: Dante, [Mario] Mandzukic, [Javi] Martinez, [Claudio] Pizarro, [Xherdan] Shaqiri and [Tom] Starke. Two outstanding footballers were then added in [Mario] Gotze and Thiago, and an excellent coach like Guardiola."
Switzerland boss Ottmar Hitzfeld, who coached Bayern in two spells in the late 1990s and the 2007-08 season, believes the current Bayern squad is the strongest ever - but admits the Bundesliga has now lost some of its appeal as a competition.
"Munich has pretty much always occupied the top spots with 11, 12 top players, but never 17 or 18," he said. "The distance between the giants and the rest of the league is too big. The Bundesliga is losing some of its charm."