Nothing of this sort could ever happen again because
it never happened.
Myth 1: Gorbachev caused the fall of USSR
Gorbachev wasn't unpredictable or inexperienced and he didn't cause the fall of USSR.
He was responsible for bringing to Moscow the guy who did it.
This guy:
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Yeltsin was brought by Gorbachev from Mukhosransk in 1985 because Yeltsin seemed like a enthusiastic reformist and Gorbachev needed supporters. Initially Yeltsin was placed in Moscow's municipal authority and then was promoted to the Central Commitee. Shortly after joining the Politburo Yeltsin began to act out his extreme narcissism and create chaos to promote himself as the true reformist very much in the same theatrical manner that Trump does. Consequently in 1987 he was demoted by Gorbachev.
That inspired Yeltsin to seek political revenge. Using the recognition that he gained during his time in Moscow he sought out support for his candidacy for the newly created Congress of People's Deputies - a constitutional body that was intended to conduct systemic change. In March 1989 Yeltsin became a deputy with overwhelming support from Moscow and from there he began his campaign against Gorbachev and "enemies of perestroyka". From there it moved quickly:
1989 March 26 - seat in Congress of People's Deputies
1989 May 23 - seat in Supreme Soviet of the Soviet Union,
1990 March 4 - seat in Congress of People's Deputies of Russia (that's the smoking gun, why move
down?)
1990 May 29 - seat in Supreme Soviet of the RFSSR
1990 June 12 - Supreme Soviet of the RFSSR adopts declaration of Russia's sovereignty
1990 July 12 - Resignation from the CPSU
1991 March 17 - Referendum on New Union Treaty, ballot in Russia has question on creation of the office of the President of RFSSR
1991 June 12 - elected president of the RFSSR
1991 August 19 - Yanayev's coup begins and Yeltisn nominally supports Gorbachev and organises civic resistance against the coup
1991 August 21 - coup fails, Yeltsin begins to take over Soviet institutions
1991 November 6 - Yeltsin bans CPSU in Russia
1991 December 8 - Belovezha Accords forming the Commonwealth of Independent States
1991 December 12 - RFSSR declared independence from the Soviet Union
1991 December 17 - Gorbachev agrees to dissolve the USSR
If you look at the timeline of declarations of sovereignty you will see that before Russia declares it in June of 1990 only the Baltics, Azerbaijan and Georgia made the declarations, Ukraine declares sovereignty on 16 July 1990, a month after Russia, as well as after Uzbekistan and Moldova,
Even then turnout for the referendum in March 1991 was very high (in Ukraine 83%, in Russia
75%) and overwhelmingly supported a reformed union state.
Soviet Union did not "collapse". Russian Republic - the state that Soviet Union supposedly superseded - returned from the dead and stabbed it in the back. Then the journey backward in time went on, the Russian Republic vanished during a war and was replaced by Putin's Russian Empire.
So why did Yeltsin do it?
Look to what happened afterward for the answer. The attempt to rule by decree which caused the 1993 constitutional crisis. The crisis was won by Yeltsin who replaced the Supreme Soviet with State Duma and ended any chance for democratic reform in Russia. The rampant theft of state industries by Yeltsin's backers and the creation of Russian oligarchy. That was
why Yeltsin had support. He sold out the country so he could play a drunken tsar.