No, for two reasons. First is that software vulnerabilities are so much more prevalent that in the real world, it would be a wasted effort to attempt to exploit these hardware side-channel vulnerabilities. There's much lower-hanging fruit elsewhere.
Second is that for the most vulnerable attack scenarios, they were mitigated long before the public release of Spectre and Meltdown. The big one was cloud computing - attackers being able to exfiltrate data from VMs running on the same host. Microsoft, Amazon and Google had many months in which to roll out updates to their infrastructure that enhanced VM isolation. Similar for browser vendors, for example Chromium introducing Site Isolation. And operating system developers - mitigations for Windows kernel and Linux were being tested for months before public disclosure.
Second is that for the most vulnerable attack scenarios, they were mitigated long before the public release of Spectre and Meltdown. The big one was cloud computing - attackers being able to exfiltrate data from VMs running on the same host. Microsoft, Amazon and Google had many months in which to roll out updates to their infrastructure that enhanced VM isolation. Similar for browser vendors, for example Chromium introducing Site Isolation. And operating system developers - mitigations for Windows kernel and Linux were being tested for months before public disclosure.