I agree (as does Dixon).The monumental failure of the Calvinist interpretation of Romans 9 is that the potter/clay analogy has anything at all to do with salvation or condemnation. Vessels of wrath or vessels of mercy does not relate to either being condemned or being saved. The point of the reference to Pharaoh in verse 17 is not about whether or not God saved Pharaoh; rather it is about how God used Pharaoh in this life to accomplishes God's own purpose. The mercy and hardening spoken of there in chapter 9 is events in this life, not the next.
Actually, if you read carefully, the text speaks of God desiring to show his wrath, but being patient instead. In Rom 2, he does so (same word for showing patience) to allow for repentance. One of the key debates concerning the "vessels" is whether they are instrumental (as in 2 Tim 2:20-21) or whether the vessels are recipients of God's wrath or mercy.The showing of His wrath to make known His power (vs. 22) is not about condemnation. It is about events in this earthly existence. We are not privy to whether anyone is eventually saved or condemned. We are made known of God's power by events that occur in this physical existence. God's entire written word, the Bible, is the record of God's providential acts in this creation and the promise of His reaction to how each of us individually responds to that record. It is not a record of individual salvation or condemnation.
While Dixon argues that they are recipients of God's wrath (leading to mercy), I tend to take a more instrumental approach to the vessels. Elsewhere in Paul the verse seems to take on an instrumental approach. Besides the verses above, 2 Cor. 4:7 speaks of us as "Jars of Clay" (a callout to a musical group I enjoyed years ago), which technically is "vessels" in the Greek. In that text, Paul speak of us as containing "the light of the knowledge of the glory of God in the face of Jesus Christ" (4:6). Paul is highlighting our weakness through which God works in the ministry of the gospel.
Dixon hints at an instrumental quality to the vessels as well, but seems to focus more on the vessels being under God's wrath. I found that portion of the study a bit too ambiguous, but I understood the direction he was taking. I believe the language points more towards instrumentality, although they could be under God's wrath as well. I suppose it is a question of which aspect is primary in the use of the term.
I think the election in view is the covenantal election of Israel through the patriarchs (Rom 11:28).The election described and displayed in Romans 9 is not about being chosen for salvation but rather about being chosen for service. Isreal (Jacob) was not chosen for salvation. God's chosen people, Isreal, were chosen (elect) to bring salvation through Jesus Christ to the world. God's sovereignty demonstrated in Romans 9 is not about who is saved or lost but about who God uses to bring salvation to mankind.