German/Czech population in modern-day Sudetenland w/o German aggression

My question is simple: How would the ratio of denizens of German and Czech ethnicity in Sudetenland have changed without an expulsion of the Germans?

There are some cities that already had quite strong Czech communities during the inter-war period. Would it all have ended like e.g. Southern Tyrol where, in spite of early attempts to majorize the local Germans, the rural landscape will likely remain German for the foreseeable future whereas the cities are more or less mixed ethnicity (Bozen/Bolzano being 70% Italian) and medics working in the area are legally required to be proficient in both languages? Or would the Czechs in the meantime even have achieved a majority in the regions even without expulsions?

What would this mean for the long-term survival of the Czechoslovak state? Is something like a Velvet Divorce yet likely to happen if both major successor states either happened to retain quite strong minorities or, if German- and Hungarian-settled regions were considered too much of a bummer, an agreement had to be reached with their respective motherlands due to the future of the local Czech or Slovak populaces that suddenly found themselves in a foreign country if said places were actually to be ceded?
 
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