<i>&gt; any library with a GPL license will eventually be replaced with a library with a more liberal license</i><p>That&#x27;s probably true, but it is not an argument against using the GPL.<p>If your GPL library is original and useful, the cost of reimplementing it will probably higher than the cost of making some depending piece of software Open Source.<p>So during the time until somebody else wrote that ISC&#x2F;MIT&#x2F;BSD version (which may be decades, think of GCC versus clang!), lots of other software may have been made Free Software that would otherwise have been proprietary.