The Current Maximum Transmission Unity or "MTU" packet size currently is roughly 65,000 bytes. This is the maximum size allowed by the Ethernet standard that includes both data and protocol overhead. 

In the future, the MTU packet size could potentially be upscaled by improving network technology and developing new standards that support larger packet sizes. However, increasing the packet size also comes with its own set of challenges and trade-offs, such as increased latency, higher risk of packet loss, and compatibility issues with older equipment. Additionally, changes to the MTU size require coordination and agreement across all network devices in order to avoid fragmentation and other issues that can impact network performance.

Would you like to know more about MTU, or other such topics?
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